.gwt-connectors-line {
  font-size: 1px;
  line-height:1px;
  background-color: grey
}

.gwt-connectors-line-vertical {
  width:2px
}

.gwt-connectors-line-horizontal {
  height:2px
}

.gwt-connectors-line-selected {
  font-size: 1px;
  line-height:1px;
  background-color: blue
}